postfix erro

quando tento..subir u posfix da erro

root@rox:/etc# /usr/sbin/postfix start

postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/active
postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/bounce
postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/corrupt
postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/defer
postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/deferred
postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/flush
postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/hold
postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/incoming
postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/private
postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/public
postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/maildrop
postfix/postfix-script: starting the Postfix mail system